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Earth, Planets and Space
Fig. 11 | Earth, Planets and Space

Fig. 11

From: Difference of horizontal-to-vertical spectral ratios of observed earthquakes and microtremors and its application to S-wave velocity inversion based on the diffuse field concept

Fig. 11

Average EMRs with normalized frequency categorized by peak frequency ranges. Peak frequency range is: top left: 0.22–1.0 Hz, middle left: 1.02–2.0 Hz, bottom left: 2.0–5.0 Hz, top right: 5.02–10.0 Hz, and middle right: 10.02–20.0 Hz. Red lines are the log-averaged values, which are used for pEHVR calculation, while orange lines are the average ± one standard deviation. The horizontal axis is the normalized frequency for each category. We can see that significant correction factors are needed in the normalized frequency range higher than 2 for Categories 1–3

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